Shaving-machine for sound-records.



T. H. MACDONALD.

SHAVING MACHINE FOR SOUND RECORDS.

APPLICATION FILED MAY 11, 1909.

Patented Apr. 25, 1911.

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' thenotch 13 at the rear of holder '12, and

the knife-holder and knife can be rocked opposite this notch is provided a notch 20. By placing the blade of a screw-driver in hole 19, so'that one edge thereof enters notch 13, and the other edge enters notch 20,

knife-bar. This bar 8' enters through the I rear wall ofbpx 21, and the edge of the knife The revolving mandrel row; so'that the surface 16' is traveling upward.

l6 protrudes slightly through an aperture in the front wall, which at this point is slightly convexed forward to act as a shield. This aperture isenlarged, below the knife, sufiicientl-y to let chips and lshavings pass .into the box. Preferably the top of the box may rest upon the bar 8, and screw, as 22, may hold the box to the bar. The bottom of the box 21 may be left open, to discharge the shavings in a larger receptacle below.-

t'carries the cylinder 5 in the direction indicated by the aradjacentthe knife In consequence, the chips or other material shaved off the cylinder 5 pass beneath knife 16, and drop into box 21. On account of the upward stress upon knife 16, knife-bar 8 hasits prime contact atthe point 23, and its secondary con tact at the point marked 6,-in other words, 7

the bar is jammed and held firmly in place. The pressure of spring 11 against head 9 tends to accentuate this; and the result of this rigid holding of the bar is'to produce a more uniform cut and a. smoothersurface upon cylinder 5. But .at the same time, the

baris readily adjustable longitudinally, to

and from the cylinder, and without stopping the operation of the shaving-machine.

Preferably the carriage is fed from the outer (smaller) end oft-he tapering mandrel, toward its inner. (larger) end. In the ordinary recording and reproducing of sound the practice'is to revolve the cylinder at a standard surface speed, but in shaving record-cylinders the machine can be run at afar higher speed; consequently there is much greater stress upon the shaving-knife than upon a recorder or reproducer. In recording and in reproducing there is no particular advantage in propelling the stylus from the outer end of the cylinder rather than from its'inner end; but if the knife of .a high-speed shaving machine should travel toward the outer or free end of the machine, there is a tendency to loosen the cylinder uponthe tapered mandrel, with consequent defects in shaving. There is. therefore, a

marked difierence, resulting in 'a decided improvement, in feeding the knife of a sl 1av-- ing-machine from the outer to the inner-end of the cylinder.

I have described my invention with some particularity but only for the sake of clearness, since modifications may be made in the construction of 'the partsand in their'arrangement, without 1n any case departingfrom thespirit of my invention.

Having thus described'my invention, I"

claim:

1. A shaving-machine for cylindrical sound-records, comprising the combination with a revoluble mandrel for carrying a record-cylinder, and a carriage traveling parallel therewith, of a shaving-knife presenting a curved edge and pivotally mount ed upon said carriage for presenting different portions of said curved edge to saidcylinder.

2. A shaving-machine for cylindrical sound-records,- comprising the combination with a revoluble mandrelj-for carrying a record-cylinder, and a carriage traveling parallel therewith, of a shaving-knife lying in a diagonalplane and having. a curved edge and pivotally mounted upon said carriage for presenting different portions of said curved edge to said cylinder.

3. A shaving'nachine for cylindrical sound-records, comprisingthe combination with a revoluble mandrel, and a carriage traveling parallel therewith, of a shavingknife mounted on said carriage and having its axis at right anglesto said mandrel-axis. and itself lying in a diagonal plane, and

' means for pivotally adjusting said knife in said diagonal plane while in'operation.

4. A shaving-machine for cylindrical sound-records, comprising the combination with a revoluble mandrel, and a carriage traveling parallel therewith, of'a shaving knife mounted on said carriage and having its axis at right angles to said mandred-axis and itself lying in a diagonal plane, means for adjusting said knife longitudinally while in operation, and additional means for pivotally adjusting said knife in said diagonal plane while in operation.

5. A shaving-machine soundrecords, comprising the combination with a revoluble mandrel, and .a carriage traveling parallel therewitlniof a horizontal knife-bar mounted transversely upon said carriage and adjustable longitudinally thereof while in operation, and having a diagonally arranged longitudinal slot inits forward end, a knife-holder and knife oivotally seated in said slot, and means for at justing the same pivotally while in operation. 6. A shaving-machine for cylindrical sound-records, comprising a tapering revoluble mandrel,- and a shaving-knife carried parallel with the axis of said mandrel and for cylindrical operating solely inthe direction from the smaller to the larger end thereof.

7. A-. shaving-machine of a tapering revoluble mandrel, and a shaving-knife located adjacent that side of said mandrel which is rotating upward and traveling parallel with said mandrel and opcrating solely in the'fdirection from the smaller to the larger end thereofi '8. A shaving-machine forcylindricalsouhd-records,- comprising the combination with 'a r evoluble mandrel, and .a' carriage traveling parallel therewith and provided With"a transverse bore and a transverse screw-threaded seat, of a headed knife-bar located in said bore and having at its forward end a diagonally-arranged longitudinal slot, a screw engagingsaid seat and the.

head of said barrespectively, and a shavingknife mounted pivotally in said slot.

9. A shaving-machine for cylindrical sound records comprising the combination with a revoluble mandrel, and a carriage;

traveling parallel therewith and provided with a transverse bore and a. transverse for cylindrical .c

sound-records, comprising the combination engagingsai'd-seat' screw-threaded seat; of zit-headed knife-bar located "in said bore andjiaving at its 'forlly-arrang'e'd slot, a screw ward end adiagon and the head of said bar -respectively;a shaving knife mounted pivotally in said? lotand means for permitting adjustment of-said'knifenpon said pivot while in operation. v

10. A shaving-imagine?ior-fcylindriaal' sound-records, comprising the combination 7 -with a revoluble mandrel, and {a carriage scribing witnesses.

THOMAS H. MACDONALD.

Witnesses ,A. .B. KEOUGH,

L. B. NICHOLSON; 

